SAN RAMON — A 27-year-old man was arrested Monday night on suspicion of attempted murder after his mother was beaten with a baseball bat at the home they shared, police said.

Aaron Ricks was standing on his Durango Lane porch with a bat when he was arrested. He advanced toward police with his bat up and officers shot him with a nonlethal projectile known as a sponge round to disarm him, according to San Ramon police Lt. Dan Pratt.

Officers had arrived at the scene just before midnight after getting a call that an elderly woman was yelling for help and bleeding badly, her son was responsible, and he was still in the area, Pratt said.

She suffered several strikes to the head and body from the baseball bat and was taken to John Muir Medical Center with significant injuries.

She remained in the hospital Tuesday with serious injuries but is expected to live, Pratt said.

Ricks was booked at county jail in Martinez on suspicion of attempted murder.

“The East Bay Times is honored for its relentless efforts to obtain police body camera videos, inspection data, and other public records in the wake of the deadly Ghost Ship fire,” the Northern California Society of Professional Journalists announced Wednesday.